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TAChart: Avoid crash in unfavorable cases when cChart, NavPanel and AutoScaleAxisTransforms are on the form (https://forum.lazarus.freepascal.org/index.php/topic,47429.0.html). Patch by PaulRowntree.

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git-svn-id: trunk@62255 -
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wp 2019-11-17 11:29:33 +00:00
parent 18fe49e2c9
commit 410b95d666
1 changed files with 6 additions and 0 deletions
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6
components/tachart/tatransformations.pas
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@ -683,6 +683,12 @@ end;
procedure TAutoScaleAxisTransform.ClearBounds;
begin
inherited ClearBounds;
// Avoid crashing when called too early, e.g. when a TNavPanel is on the form
// https://forum.lazarus.freepascal.org/index.php/topic,47429.0.html
if FDrawData = nil then
exit;
with TAutoScaleTransformData(FDrawData) do begin
FMin := SafeInfinity;
FMax := NegInfinity;